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at first i did not see her face.如果用can

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at first i did not see her face.如果用can
at first i did not see her face.如果用can't效果一样吗?
at first i did not see her face.如果用can
did这里是助动词.标志的是一般过去时...
用can 的话,理论上是 I couldn't see her face .
再问: 请问助动词一般有什么效果?
再答: 单纯的助动词能看出句子的时态。。。和辅助完成句型转换。